Of these 3 methods, which one would you expect to perform the best on PostgreSQL for Aurora (frontend is based on Postgres 9.6.1, backend is amazon proprietary thing), and why? Note that I’m not actually selecting any data from TAGS_TBL or using anything from it elsewhere in the query.

The “where in” version with the subquery seems the most readable and straightforward, but my gut says that it’s also the slowest.

Thanks!

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